import java.util.Scanner;

public class In_Out {
    public static void main(String[] args) {
        //输出
        System.out.println("Hello World");
        //输入
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入一个整数：");
        int a = sc.nextInt();
        System.out.println("您输入的整数是：" + a);
        sc.close();

    }
}
